Rotary-kiln feed



March 26, 1929. E. MINOGUE ROTARY KILN FEED 2 Sheets-Sheet 1 Filed June18, 1926 F Max. 26, 1 929.

v UNITED STATES PATE ltfllhfllflfi E. MINOG'UE, U1? MANITUWUU,WISCONSIN, ASSIGNbR T MINOGUE. ENGINEER- I'Ntl- UMPANY, 0F MANIJIPUWOU,WISCONSIN.

application filed .Ilune lit,

This invention" relates to a device for feeding the flue dust to thekiln of a wet process cement plant its heretofore practiced, it is theusual custom to mix the flue dust with the wet slurry. lhis flue dusthas properties that make the slurry practically impossible to-handleand,

consequently, materially decrease the value of the output from theplant.

This invention is designed to overcome the above noted defects inrecovering flue dust and mining it with the outgoing ma- ;terial undertreatment, and has for its primary objects the mixing of the flue dustwith the contents of the kiln in its dry form, and the returning of theflue dust to the kiln in the dry tone. lln these devices it is highlyadvantageous to prevent the entrance of cold air into the kiln. Thisinvention also has for its objects the provision of means for feedingthe flue dust uniformly into the kiln while it is in operation withoutallowing the entrance of cold air.

.drn embodiment of the invention is shown in the accompanying drawingsin which Figure l is a transverse sectional view through a rotary kilnshowing the feeding device in operation. a

Figure 2 is a fragmentary side view with parts broken away showing aportion of the structure illustrated in Figure l.

Figure 3 is a sectional view developed along the line 33 of Figure l.

*lfleferring to the drawing it will be seen that a rotary kiln l of theinclined type is provided. 'llhis kiln is preferablyv lined with flrebrick or fire clay, as indicated at 2 in Figure l, inthe usual manner.llt is surrounded at any suitable point in its length by an annularreceiving compartment 3 which receives the flue dust in a continuousstream from any suitable source, such flue dust being fed downwardlythrough the pipe t; This flue dust collects in the lower portion of theannular chamber '3 and is picked up and delivered by the mechanismhereinafter described at each revolution of the kiln.

Thekiln is provided with a curved pipe 5 which is preferably formed insections and is returned to the kiln at the dry zone and in which isprovided with a ap or valve 6 intermediate its length. This valve isrigidly carried by a rocker shaft 7 which projects outwardly beyond theside of the pipe 5 and is provided with a lever 8, and with a rocker ata or lever 9.. The lever t is attached to race. serial no. iiaaer.

,lected thereby, through such portion. The

outer end of the pipe 5 is flared to form a funnel-like scoop M whichdigs into the dust in the lower portion of the receptacle 3 and scoopsup the dust into the pipe 5.

The operation of the apparatus is as follows: r

the kiln is rotated in the direction indicated by the arrow in Figure l,and the pipe 5 is filled with flue dust while the pipe passes throughthe lower portion of the compartment 3. However, the pipe 5 is closedthroughout the major portion of the rotation of the kiln by means of thevalve 6. ll hernhowever, the load (see Figure 1) covers the mouth of thepipe 13, the flap or valve 6 opens. 'llhis opening is accomplished bythe riding of the roller 11 upon the cam track 12, the position of theparts being as indicated in Figure l. The flue dust is thus dischargedby gravity past the valve through the pipe 5 and into the kiln 1. it isto be noted that the valve closes before the pipe passes from beneaththe load 15 within the kiln and consequently there is, at all times, acold air seal as the pipe is either closed by the load within the kiln,or else is closed by'the' valve. in addition tothis the flue dust isevenly distributed and mixed with the load within the kiln by thisvapparatus, as it is gradually discharged into the kiln by the action ofgravity during the rotation of the kiln. lln addition to this, eachrotation of the'kiln discharges a predetermined measured amount of theflue dust into the kiln, and, consequently, insures the uniformity ofthe mixture. p

lt will be seen, therefore, that the ac dust its dried state.Consequently, the output is of a maximum quality, although the flue tilltill

llll

vided for accomplishing the above noted functions and it will be seenfurther, that the device is wholly automatic in its action, and does notrequire any thought on the part of the operator. I

It is a well known fact in the cement industry that the capacity of awet process kiln is limited by the amount of slurry which can be fedinto the open end of the kiln. This is due to the slurry, which containsapproximately 33% moisture, spilling back out of the open end of thekiln, and it is also to a certain extent due to the fact that increasingthe amount of slurry put into the open end of the kiln, increases thelength of What is commonly called the wet zone of the kiln. It being awell known fact that the shorter the wet zone in the kiln the greaterits. efficiency is.

In the practice of this invention, it is a parent that any desiredmaterial may e fed into the kiln by the apparatus described and it isfurther apparent that the particular point or zone of the kiln may beselected as desired.

For example, it may be found expedient to feed the slurry into the kilnby means of the construction described in detail above and in this casethe slurry would be fed into the wet zone of the kiln.

. V, In this way, it is possible to feed any material at any point ofthe kiln with the utmost facility.

It is, therefore, to be understood that this construction can be usedfor theintroduction of slurry into the kiln as well as for theintroduction of flue dust, as previously set forth in detail.

This invention, therefore, provides a novel means of introducingmaterial into a kiln through a hole in the side of the kiln where thefeed pipe opens. Obviously, therefore, the efliciency of the kiln andthe capacity thereof, can be greatly increased in thedetermined asclaimed.

I claim: 1. The combination of a rotary kiln, an

annular chamber surrounding said kiln,

means for conducting material into said chamber comprising a materialcollecting pipe rigidly carried by said kiln and adapted to rotate withsaid kiln, said pipe having a discharge mouth opening into said kiln,said pipe being located-within said annular chamber, a valve locatedwithin said pipe, and

means for opening said valve only at the charge mouth opening throughsai kiln at one end and having a scoop-like portion at its other endadapted to scoop up a charge of dust during each revolution of the kiln,said scoop-like portion and said discharge mouth being circumferentiallyspaced around said kiln with the scoop-like ortion leading, a valvelocated within said pipe, and means for opening said valve when saiddischarge mouth is adjacent its lowest position and said scoop-likeportion is elevated, and means for holding said valve closed when saidmouth has passed from a position adjacent its lowest position.

3. The combination of a rotary kiln, an annular dust receiving chambersurrounding the kiln, means for conducting dust into said chambercomprising a curved pipe partly encircling said kiln and rigidly carriedby said kiln and located within said annular chamber, said pipe having adischarge mouth opening through said kiln at one end and having ascoop-like portion at its otherend adapted to scoop up a charge of dustduring each revolution of the kiln, said scoop-like portion and saiddischarge mouth being circumferentially spaced around said kiln with thescoop-like portion leading, a valve located within said pipe, meanstending to hold said valve closed, and cam means for opening said valvewhen said discharge mouth is adjacent its lowest position.

' In testimony that I claim the foregoing I have hereunto set my hand atManitowoc in the county of Manitowoc and State of Wisconsin.

ROLAND E. MINOGUE.

